One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,11)(3,7,8,15)(4,13,14,12)(5,10,16,9)(17,18)(19,28)(20,33)(21,23)(22,27)(24,31)(25,35)(26,36)(29,43)(30,41)(32,39)(34,38)(37,42)(40,44)(45,47)(46,48)(1,3)(2,7)(4,10)(5,12)(6,8)(9,14)(11,15)(13,16)(18,23)(20,34)(21,36)(24,39)(25,33)(26,27)(28,41)(29,44)(30,31)(35,37)(43,48)(45,46) involution — undirected(1,4,6,14)(2,8,11,3)(5,15,16,7)(9,12,10,13)(17,19,22,32)(18,24,27,41)(20,29,35,46)(21,30,36,31)(23,28,26,39)(25,40,33,47)(34,44,37,45)(38,43,42,48)(1,3)(2,4)(5,13)(6,8)(7,10)(9,15)(11,14)(12,16)(17,20,22,35)(18,25,27,33)(19,29,32,46)(21,37,36,34)(23,38,26,42)(24,40,41,47)(28,43,39,48)(30,45,31,44)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.